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Maintenance and Service Guide 5-3
Addendum 108431-001 (11-88) to
Manual No. 108033-003
Table 5-1. Power-On Self-Test Error Messages Continued
Message Beeps Probable Cause Recommended Action
402–Monochrome
Adapter Failure
1L
1
, 2S
2
Monochrome display
controller board
Replace the monochrome display con-
troller board.
501–Display Adapter
Failure
1L
1
, 2S
2
Video display controller
board
Replace the video board.
601–Diskette Controller
Error
None Multipurpose fixed disk
drive controller board
Replace the multipurpose fixed disk
drive controller board.
605–Diskette Drive
Type Error
Mismatch in drive type Run Setup.
702–Coprocessor
Detection Error
None Coprocessor or switch
setting problem
1. Check the switch settings.
2. Replace the coprocessor.
1780–Disk 0 Failure None Fixed disk drive/format error Run ADVANCED DIAGNOSTICS.
1781–Disk 1 Failure None Fixed disk drive/format error Run ADVANCED DIAGNOSTICS.
1782–Disk Controller
Failure
None Fixed disk drive controller
error
Run ADVANCED DIAGNOSTICS.
1790–Disk 0 Error None Fixed disk drive recalibration
or wrong drive type
Run SETUP and ADVANCED
DIAGNOSTICS.
1791–Disk 1 Error None Fixed disk drive recalibration
or wrong drive type
Run SETUP and ADVANCED
DIAGNOSTICS.
Parity Check 2 XX000Y ZZ None Parity RAM failure Run ADVANCED DIAGNOSTICS.
Audible 1S
2
Power-on successful None.
Audible 2S
2
Power-on successful None.
(RESUME = “F1” KEY) None As indicated Press F1 key to continue.
1
L = Long
2
S = Short